<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>map-state</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="https://unpkg.com/vuex@3.6.2/dist/vuex.js"></script>
</head>
<body>
    <div id="app">
        <p>{{message}}</p>
    </div>

    <script>
        const store = new Vuex.Store({
            state:{
                msg:"hello,world!",
            },
            getters:{
                // 需要传入state中
                msgUpper(state){
                    return state.msg.toUpperCase();
                }
            }
        })

        var app = new Vue({
            el:"#app",
          
            store:store,
            computed:{
                // message(){
                //     return this.$store.state.msg.toUpperCase();
                // },
                message(){
                    return this.$store.getters.msgUpper;
                }
            },
          
        })



    </script>


</body>
</html>